Summary Description of the Company	9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]
Summary Description of the Company	Note 1 — Summary Description of the Company The accompanying unaudited condensed financial statements are those of Lucid Diagnostics Inc. (“Lucid Diagnostics” or “the Company”), which was incorporated in the State of Delaware on May 8, 2018. Lucid Diagnostics Inc. is a majority-owned subsidiary of PAVmed Inc., as discussed below. The Company operates in one segment as a medical diagnostics technology company focused on the relationship between ubiquitous gastroesophageal reflux disease - “GERD” - which is also known as chronic heartburn, acid reflux or simply reflux, and highly lethal esophageal cancer, specifically esophageal adenocarcinoma (EAC). Lucid Diagnostics Inc. entered into a patent license agreement with Case Western Reserve University (“CWRU”), captioned the Amended and Restated License Agreement, dated August 23, 2021 (“Amended CWRU License Agreement”). The Amended CWRU License Agreement is a successor to and replaced in its entirety the previous CWRU License Agreement, dated May 12, 2018. The Amended CWRU License Agreement terminates upon the expiration of certain related patents, or on May 12, 2038 in countries where no such patents exist, or upon expiration of any exclusive marketing rights granted by the FDA or other U.S. government agency, whichever comes later. The Amended CWRU License Agreement (as did the predecessor CWRU License Agreement) provides for the exclusive worldwide license of the intellectual property rights for the proprietary technologies of two distinct technology components - the “EsoCheck Cell Collection Device” referred to as “EsoCheck®”; and a panel of proprietary methylated DNA biomarkers, a laboratory developed test (“LDT”), referred to as “EsoGuard®”; and together are collectively referred to as the “EsoGuard Technology”. See Note 3, Patent License Agreement – Case Western Reserve University, for a discussion of the Amended CWRU License Agreement. EsoCheck has received 510(k) marketing clearance from the FDA as an esophageal cell collection device in June 2019; and EsoGuard completed the certification required by the Clinical Laboratory Improvement Amendment (“CLIA”) and accreditation of the College of American Pathologists making it commercially available as a Laboratory Developed Test (“LDT”) in December 2019. The EsoGuard^®diagnostic LDT and the EsoCheck^® cell sample collection device constitute the first and only commercially available diagnostic test capable of serving as a widespread screening tool to prevent EAC deaths through early detection of esophageal precancer and cancer in at-risk GERD patients. Since its inception, the Company has advanced the proprietary technologies underlying EsoGuard and EsoCheck from the academic research laboratory to commercial diagnostics tests and devices with scalable manufacturing capacity. The Company is presently focused on expanding commercialization across multiple sales channels, including: the communication and education of medical practitioners and clinicians of the EsoGuard LDT; and establishing “Lucid Diagnostics Test Centers” for the collection of cell samples using EsoCheck and delivery of the collected cell samples to ResearchDX Inc. (“RDx”), a CLIA certified commercial laboratory service provider, for the performance of the EsoGuard LDT. Additionally, the Company is conducting two concurrent clinical trials, including each of: the “EsoGuard screening study” (“ESOGUARD-BE-1”); and the “EsoGuard case control study” (“ESOGUARD-BE-2”), to support United States Food and Drug Administration (“FDA”) pre-market approval (“PMA”) of the use of EsoGuard and EsoCheck as an in-vitro diagnostic medical device (“IVD”). Further, the Company is developing expanded clinical evidence to support recommendation of our products in professional society guidelines. Note 1 — Summary Description of the Company - continued Lucid Diagnostics Inc. Common Stock Issued and Outstanding - September 30, 2021 As of September 30, 2021 and December 31, 2020, there were 14,114,707 shares of common stock of Lucid Diagnostics Inc. issued and outstanding, of which, PAVmed Inc. holds 11,552,562 shares, representing a majority ownership equity interest and has a controlling financial interest in Lucid Diagnostics Inc., and accordingly, Lucid Diagnostics Inc. is a consolidated majority-owned subsidiary of PAVmed Inc., as of each such date. Authorized Shares Increase and Stock-Split - October 6, 2021 Subsequent to September 30, 2021, effective October 6, 2021, the Lucid Diagnostics Inc. board of directors: increased the authorized shares of common stock of Lucid Diagnostics Inc. to 100.0 million shares; and declared a 1.411-to-1.0 common stock-split with respect to Lucid Diagnostics Inc. common stock, as discussed below. PAVmed Inc Conversion of the Senior Unsecured Promissory Note Principal - October 13, 2021 Subsequent to September 30, 2021, on October 13, 2021, 15,803,200 shares of common stock of Lucid Diagnostics Inc. were issued to PAVmed Inc. upon the election by PAVmed Inc. to convert the $22.4 million face value principal of a Senior Unsecured Promissory Note, dated June 1, 2021, under the terms of such note, which was issued to PAVmed Inc. by Lucid Diagnostics Inc. Lucid Diagnostics Inc. Initial Public Offering - October 14, 2021 Subsequent to September 30, 2021, on October 14, 2021, Lucid Diagnostics Inc. completed an initial public offering (“IPO”) of its common stock under an effective registration statement on Form S-1 (SEC File No. 333-259721), wherein a total of 5.0 million IPO shares of common stock were issued, with such total IPO shares inclusive of 571,428 IPO shares issued to PAVmed Inc., at an IPO offering price of $14.00 per share, resulting gross proceeds of $70.0 million, before underwriting fees of $4.9 million, and approximately $0.7 million of offering costs incurred by the Company.

Summary Description of the Company

9 Months Ended

Sep. 30, 2021

Note 1 — Summary Description of the Company

The accompanying unaudited condensed financial statements are those of Lucid Diagnostics Inc. (“Lucid Diagnostics” or “the Company”), which was incorporated in the State of Delaware on May 8, 2018. Lucid Diagnostics Inc. is a majority-owned subsidiary of PAVmed Inc., as discussed below.

The Company operates in one segment as a medical diagnostics technology company focused on the relationship between ubiquitous gastroesophageal reflux disease - “GERD” - which is also known as chronic heartburn, acid reflux or simply reflux, and highly lethal esophageal cancer, specifically esophageal adenocarcinoma (EAC).

Lucid Diagnostics Inc. entered into a patent license agreement with Case Western Reserve University (“CWRU”), captioned the Amended and Restated License Agreement, dated August 23, 2021 (“Amended CWRU License Agreement”). The Amended CWRU License Agreement is a successor to and replaced in its entirety the previous CWRU License Agreement, dated May 12, 2018. The Amended CWRU License Agreement terminates upon the expiration of certain related patents, or on May 12, 2038 in countries where no such patents exist, or upon expiration of any exclusive marketing rights granted by the FDA or other U.S. government agency, whichever comes later.

The Amended CWRU License Agreement (as did the predecessor CWRU License Agreement) provides for the exclusive worldwide license of the intellectual property rights for the proprietary technologies of two distinct technology components - the “EsoCheck Cell Collection Device” referred to as “EsoCheck®”; and a panel of proprietary methylated DNA biomarkers, a laboratory developed test (“LDT”), referred to as “EsoGuard®”; and together are collectively referred to as the “EsoGuard Technology”. See Note 3, Patent License Agreement – Case Western Reserve University, for a discussion of the Amended CWRU License Agreement.

EsoCheck has received 510(k) marketing clearance from the FDA as an esophageal cell collection device in June 2019; and EsoGuard completed the certification required by the Clinical Laboratory Improvement Amendment (“CLIA”) and accreditation of the College of American Pathologists making it commercially available as a Laboratory Developed Test (“LDT”) in December 2019.

The EsoGuard^®diagnostic LDT and the EsoCheck^® cell sample collection device constitute the first and only commercially available diagnostic test capable of serving as a widespread screening tool to prevent EAC deaths through early detection of esophageal precancer and cancer in at-risk GERD patients.

Since its inception, the Company has advanced the proprietary technologies underlying EsoGuard and EsoCheck from the academic research laboratory to commercial diagnostics tests and devices with scalable manufacturing capacity. The Company is presently focused on expanding commercialization across multiple sales channels, including: the communication and education of medical practitioners and clinicians of the EsoGuard LDT; and establishing “Lucid Diagnostics Test Centers” for the collection of cell samples using EsoCheck and delivery of the collected cell samples to ResearchDX Inc. (“RDx”), a CLIA certified commercial laboratory service provider, for the performance of the EsoGuard LDT. Additionally, the Company is conducting two concurrent clinical trials, including each of: the “EsoGuard screening study” (“ESOGUARD-BE-1”); and the “EsoGuard case control study” (“ESOGUARD-BE-2”), to support United States Food and Drug Administration (“FDA”) pre-market approval (“PMA”) of the use of EsoGuard and EsoCheck as an in-vitro diagnostic medical device (“IVD”). Further, the Company is developing expanded clinical evidence to support recommendation of our products in professional society guidelines.

Note 1 — Summary Description of the Company - continued

Lucid Diagnostics Inc. Common Stock

Issued and Outstanding - September 30, 2021

As of September 30, 2021 and December 31, 2020, there were 14,114,707 shares of common stock of Lucid Diagnostics Inc. issued and outstanding, of which, PAVmed Inc. holds 11,552,562 shares, representing a majority ownership equity interest and has a controlling financial interest in Lucid Diagnostics Inc., and accordingly, Lucid Diagnostics Inc. is a consolidated majority-owned subsidiary of PAVmed Inc., as of each such date.

Authorized Shares Increase and Stock-Split - October 6, 2021

Subsequent to September 30, 2021, effective October 6, 2021, the Lucid Diagnostics Inc. board of directors: increased the authorized shares of common stock of Lucid Diagnostics Inc. to 100.0 million shares; and declared a 1.411-to-1.0 common stock-split with respect to Lucid Diagnostics Inc. common stock, as discussed below.

PAVmed Inc Conversion of the Senior Unsecured Promissory Note Principal - October 13, 2021

Subsequent to September 30, 2021, on October 13, 2021, 15,803,200 shares of common stock of Lucid Diagnostics Inc. were issued to PAVmed Inc. upon the election by PAVmed Inc. to convert the $22.4 million face value principal of a Senior Unsecured Promissory Note, dated June 1, 2021, under the terms of such note, which was issued to PAVmed Inc. by Lucid Diagnostics Inc.

Lucid Diagnostics Inc. Initial Public Offering - October 14, 2021

Subsequent to September 30, 2021, on October 14, 2021, Lucid Diagnostics Inc. completed an initial public offering (“IPO”) of its common stock under an effective registration statement on Form S-1 (SEC File No. 333-259721), wherein a total of 5.0 million IPO shares of common stock were issued, with such total IPO shares inclusive of 571,428 IPO shares issued to PAVmed Inc., at an IPO offering price of $14.00 per share, resulting gross proceeds of $70.0 million, before underwriting fees of $4.9 million, and approximately $0.7 million of offering costs incurred by the Company.